Think about it this way: people who leave an ecosystem for mostly-aesthetic or status-signalling reasons (e.g. a small touchscreen replacing some keys they don't use, making their favoured device appear less 'professional' according to people who've never used it) are likely willing to discard other options for reasons that are just as petty.
I haven't heard any criticism of the touchbar predicated on it making the device "appear less 'professional'" at all; I don't even understand why anyone would think that.